Imaginary Picture of WASP-77 A b

Display orbital revolution of WASP-77 A b around the hoststar WASP-77A
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Exoplanet Name : WASP-77 A b
Alternate Name :
Radius (Rjup / Re): 1.2100 (Rjup) 13.5629 (Rearth)
Mass (Mjup / Me): 1.7600 (Mjup) 559.5709 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0240 (AU) 0.0240 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0037
Orbital Period(Observed/Estimated) 1.36 (Days Obs.) 1.36 (Days Est.)
Surface Gravity (G Earth) 3.0419
Star Radiation at Atmospheric Boundary: 1776805.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1629.5 (K)
Blackbody T 0.3(K) 1530.3 (K)
Blackbody T 0.7(K) 1238.1 (K)
Tidally Locked Blackbody T 0.1(K) 1937.8 (K)
Tidally Locked Blackbody T 0.3(K) 1819.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : WASP-77A
Alternate Name :
Star Distance(LY) : 329.5
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 1.0 (GY)
Temperature : 5500 (K)
Spectral type : G8V
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : 0.0
Absolute Magnitude: 6.3
Apparent Magnitude: 11.3
Right Ascension(RA) 37.1551
Declination (DEC) -7.0606
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "P. F. L. Maxted, D. R. Anderson, A. Collier Cameron, A. P. Doyle, A. Fumel, M. Gillon, C. Hellier, E. Jehin, M. Lendl, F. Pepe, D. L. Pollacco, D. Queloz, D. S_gransan, B. Smalley, J. K. Southworth, A. M. S. Smith, A. H. M. J. Triaud, S. Udry, R. G. West"
Discovery Paper - Title WASP-77 Ab: A transiting hot Jupiter planet in a wide binary system
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-77+A+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/WASP-77%20A%20b/
WASP-77 A b
WASP-77 A b

  • WASP-77 A b is an exoplanet orbiting the star WASP-77A, located about 329.5 light-years (101.0 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star WASP-77A has apparent magnitude of 11.3, with absolute magnitude of 6.3.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5500 with its spectral types of G8V
  • In this planetary system, the extrasolar planet WASP-77 A b orbits around the star WASP-77A every 1.4 days with its orbital distance of 0.02 AU ( 3590348.9 km)
  • (Projected orbit of WASP-77 A b around its host star WASP-77A)


  • The Star WASP-77A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.626 AU ( 93623929.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.865 AU ( 129412736.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.318 AU ( 197196372.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.940 AU ( 290183100.0 km)
  • Radiation at Planetary Boundary of WASP-77 A b : 1776805.25 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star WASP-77A)



  • Kopparapu Recent Venus for Star WASP-77A distance : 0.659 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star WASP-77A distance : 0.835 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star WASP-77A distance : 0.806 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star WASP-77A distance : 0.884 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star WASP-77A distance : 1.486 AU
  • Kopparapu Outer Boundary for Early Mars for Star WASP-77A distance : 1.568 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star WASP-77A)



  • Original Kopparapu Recent Venus for Star WASP-77A distance : 0.657 AU
  • Original Kopparapu Runaway Greenhouse for Star WASP-77A distance : 0.859 AU
  • Original Kopparapu Moist Greenhouse for Star WASP-77A distance : 0.869 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star WASP-77A distance : 1.512 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star WASP-77A distance : 1.572 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star WASP-77A)



    (Position in Stellar Map of star WASP-77A and its Exoplanet WASP-77 A b)



    (Zoomed position in Stellar Map of star WASP-77A and its Exoplanet WASP-77 A b (zoom level 3))

    (Synthetic Spectrum of star WASP-77A*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102